#include<iostream>
using namespace std;
int main(){
    int x=56;
    int&a = x;
    int&r = a;
    cout << "x=" << x << ", &x=" << &x << ",a=" << a <<",&a=" << &a << ", r= " << r << ", &r=" << &r << endl;
    r=25;
    cout << "x=" << x << ", &x=" << &x << ",a=" << a <<",&a=" << &a << ", r= " << r << ", &r=" << &r << endl;
    return 0;
}
